Enhanced Colossal Permittivity and Reduced Loss in (Cu۱/۳Nb۲/۳)x Ti۱-xO۲ Ceramics for High-Frequency Applications

Colossal permittivity (CP) in aliovalent co-doped rutile TiO۲ offers promising potential for high-performance dielectric applications. Here, TiO۲ ceramics co-doped with (Cu۱/۳Nb۲/۳)۰.۰۴ Ti۰.۹۶O۲ were synthesized via ball milling and high-temperature sintering. XRD confirmed the rutile structure, while SEM revealed Cu-induced irregular grain boundaries, favoring Internal Barrier Layer Capacitor (IBLC) behavior. Dielectric measurements showed a dramatic enhancement of ɛ' from ۷۶۰ to ۸۴۳۰ at ۱۰۰ kHz, with tanδ reduced from ۰.۲۶ to ۰.۰۵. These results highlight the effectiveness of the fixed donor-acceptor co-doping strategy in producing ceramics with ultra-high permittivity and low losses.

کلیدواژه ها:

Colossal permittivity ، Donor-acceptor engineering ، IBLC mechanism ، TiO۲ ceramics